On 9/27/21 8:09 PM, Krzysztof Kozlowski wrote: > On Mon, 13 Sept 2021 at 06:32, Christian Hewitt > <christianshewitt@xxxxxxxxx> wrote: >> >> https://protect2.fireeye.com/v1/url?k=6f7d4070-30e6793d-6f7ccb3f-0cc47aa8f5ba-2c8976d4b015314f&q=1&e=776d64d2-22f3-400a-a241-42af8b5f60d0&u=https%3A%2F%2Fgithub.com%2Fchewitt%2Flinux%2Fcommit%2F8a4ebfb43a394e5dc5e9fafc92a50d5e81a4f258 >> >> If I boot any recent kernel without the above patch, the emmc module on the XU4 is not detected, see: >> >> Without: >> >> [ 3.227837] mmc0: tuning execution failed: -5 >> [ 3.231229] mmc0: error -5 whilst initialising MMC card >> [ 3.536450] mmc0: tuning execution failed: -5 >> [ 3.539680] mmc0: error -5 whilst initialising MMC card >> [ 3.794056] mmc0: tuning execution failed: -5 >> [ 3.794212] mmc0: error -5 whilst initialising MMC card >> [ 4.111097] mmc0: tuning execution failed: -5 >> [ 4.115356] mmc0: error -5 whilst initialising MMC card >> [ 4.426164] mmc0: tuning execution failed: -5 >> [ 4.429678] mmc0: error -5 whilst initialising MMC card >> [ 4.756226] mmc0: tuning execution failed: -5 >> [ 4.760641] mmc0: error -5 whilst initialising MMC card >> >> With: >> >> [ 3.305461] mmc0: new HS400 MMC card at address 0001 >> [ 3.307444] mmcblk0: mmc0:0001 8GME4R 7.28 GiB >> [ 3.308132] mmcblk0boot0: mmc0:0001 8GME4R 4.00 MiB >> [ 3.309172] mmcblk0boot1: mmc0:0001 8GME4R 4.00 MiB >> [ 3.310255] mmcblk0rpmb: mmc0:0001 8GME4R 512 KiB, chardev (246:0) >> [ 3.315963] mmcblk0: p1 p2 >> >> The patch is sourced from a Linux 5.4 patchset used by several retro gaming distros for XU4 images shared in the HardKernel forums. I would be happy to submit it, but the original patch has no description in the commit message. Not being a coding developer myself I cannot explain whether it is correct or what it’s doing to add one. All I can do is confirm that it works, and is needed. SD card boot is not an issue. >> >> I’ve CC’d the original author (Marian) in case he remembers the patch and can comment. It would be good to get this upstream. > > The patch might have sense but would require describing conditions - > what MMC input and output clock settings work and which do not work. > Also someone would need to test other Exynos5422 boards and other > Exynos with HS200 and HS400 support (Exynos5433, Exynos7). I think > this should not affect SD cards. Thanks for adding me. I didn't see XU4 booting fail with linux-5.15-rc1 kernel. [ 4.561934] mmc1: new HS400 MMC card at address 0001 [ 4.572401] mmcblk1: mmc1:0001 SDW16G 14.7 GiB [ 4.602555] mmcblk1: p1 p2 p3 p4 < p5 p6 p7 > [ 4.623201] mmcblk1boot0: mmc1:0001 SDW16G 4.00 MiB [ 4.640465] mmcblk1boot1: mmc1:0001 SDW16G 4.00 MiB Which kernel version did you use? Best Regards, Jaehoon Chung > > +Cc Marek, Sylwester, Jaehoon and Ulf. > > Best regards, > Krzysztof >
